1,720,991 research outputs found
Dictyostelium discoideum: un modello cellulare per lo studio degli effetti di shock termici e di variazioni graduali della temperatura. Atti 69° Congr. Naz. U.Z.I., Senigallia (AN), 2008
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Caratterizzazione della sintesi della molecola segnale ossido nitrico in Paramecium primaurelia
No full textCaratterizzazione della sintesi della molecola segnale ossido nitrico in Paramecium primaurelia.
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Valutazione tossicologica della presenza di fitofarmaci neurotossici nelle acque, utilizzando Dictyostelium discoideum (Protisti).
No full textOrganic matter recycling in a beach environment influenced by sunscreen products and increased inorganic nutrient supply (Sturla, Ligurian Sea, NW Mediterranean)
No full textThe beaches are sites where the human influence may be strong and the beach ecosystems have often shown a
high sensibility to environmental alterations. These zones may be affected by a large series of anthropogenicderived
pressures, such as unbalanced inorganic nutrient input, that may cause anomalous development of
primary production, altering the structure of the trophic webs. Furthermore, the utilisation of cosmetic
sunscreen products is reaching unexpected levels, thus assuming a potentially important as well as unknown
role in the contamination of marine environments. The present study was planned to test the response of the
beach ecosystem to increases in inorganic nutrients (nitrate and phosphate) and to the input of a widely used
cosmetic sunscreenproduct. A short-term laboratory experiment was carried out on microsystems consisting
of sediments and seawater from the swash zone of a Ligurian city beach (Sturla). The processes related to
organic matter (OM) recycling and some microbial food web components (bacteria and micro-autotrophic
organisms) were analysed. The multivariate statistical analysis of the results showed that the increase in
inorganic nutrients and sunscreen caused only a transient alteration in the OM recycling processes in the
seawater. The sedimentary processes, instead, were different in the different systems, although starting from
the same condition. In the sediment, surprisingly, an increase in inorganic nutrients did not lead to an increase
in the primary biomass nor to significantly higher bacterial abundance, while the sunscreen caused increased
OM recycling, especially devoted to protein and lipid mobilisation, supporting a growing bacterial and
autotrophic community by reducing the bottom-up pressure. Additional toxicity tests performed on protozoa
highlighted that, while the inorganic nutrients seemed to show no effects, sunscreen decreased the protozoan
viability, thus likely favouring microautotrophic and bacterial increases by reducing the top-down pressure
Effects of time-variant extremely-low-frequency (ELF) electromagnetic fields (EMF) on cholinesterase activity in Dictyostelium discoideum
No full textRecently, we detected propionylcholinesterase (PrChE) activity in single-cell amoebae of Dictyostelium discoideum using cytochemical, electrophoretic, and spectrophotometric methods. The involvement of this enzyme activity in cell-cell and cell-environment interactions was suggested. In this work, we found that exposure of single-cell amoebae to an extremely low-frequency electromagnetic fields (ELF-EMF) of 300 μT, 50 Hz, from 1 h up to 48 h at 21 ± 1 °C affected PrChE activity
Dictyostelium discoideum un modello cellulare per lo studio degli effetti delle variazioni della temperatura su ecosistemi agricoli. Perugina, IT, pp. 33-35, 2009
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